In this Article, we make the first step towards such understanding by considering magnetism in BLG induced by magnetic materials applied to one or two sides of the BLG sample [Fig. 1(c)]. We only consider materials with out-of plane magnetization, which can induce ferromagnetic (FM), andiferromagnetic (AFM), or ferrimagnetic (FIM) order in BLG. The out-of-plane magnetization we concentrate on favors ultrahigh-density data storage [1]} and is usually superior to the canted or in-plane magnetization [2]}, [3]}. Further considering the ultra-short range nature of the proximity effect [4]}, [5]}, [6]}, [7]}, we reasonably assume that the proximity-induced magnetism of two opposite layers of BLG is almost unaffected by the presence of another layer, as rigorously proven by previous first-principles calculations and fitting models [7]}, [6]}, [4]}, [5]}. This suggests that BLG is an excellent platform to engineer layered spintronics, which is proposed here as a separate branch of spintronics due to the independent variability and control of each layer of magnetism. The term “layered spintronics" is different from that used in previous works [12]}, [13]}, [14]}, which mention “layered spintronics materials" but do not explore the possibility that magnetic structure of every layer can be modified. Encouragingly, the emerging of abundant ultrathin vdW materials [15]}, [16]}, [17]}, [18]}, [19]} provides a rich soil for such modifications and thus for the development of layered spintronics.
